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EXCERPT page containing first few paragraphs. 2023-12-01 15:03:22

150MP Phase One IQ4
Schneider Kreuznach LS 80mm f/2.8

Examples: Death Valley / Eureka Dunes Area (IQ4 150)

These examples in the Death Valley area.

Includes images up to full 151MP camera resolution (14204 X 10652). Also includes 100 megapixel downsampled variants for perspective versus Fujifilm GFX100.

Last Chance Wash

This 14-shot focus stack took over 6 minutes, with exposure time of 20 seconds per frame. The Phase One IQ4 made it longer than necessary by doing dark frames at random intervals for some of the images of the sequence, good for a tiny improvement in image quality, but bad when the light is failing. Later frames captured very different white balance and tint from the first frame and needed adjustment, which I made (crudely, too time consuming). The first frame was pushed 0.5 stops, with the last frame pushed 2.66 stops—not ideal, but I used the IQ4 focus stacking feature in manual exposure mode and such is the falloff in brightness in just 6 minutes at dusk. There was a mild downhill downdraft which moves the brush, causing blur there.

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  • In-depth lens evaluations covering behaviors not likely to be found anywhere else, based on real-world field shooting.
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Variants Stack14,SingleFrame available in full article
f11 @ 20.0 sec electronic shutter focus stack 14 frames, ISO 50; 2019-12-09 17:00:23
Phase One IQ4 + Schneider Kreuznach LS 80mm f/2.8 + polarizer Zeiss
ENV: canyon SE of Eureka Dunes, altitude 4100 ft / 1250 m, 55°F / 12°C
RAW: LACA corrected, push 1.6 stops, USM {8,50,0}, SmartSharpen{60,0.8,0}, diffraction mitigating sharpening

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